What should I do

I am 16 year old male and often go to my dads every weekend. When I stay over his fiancée is always walking around in see through tops and I get such a b**** when I see her. Years ago when I was like 8 I used to apparently try and pull her pants off and she would try to dack me but I was young and didn't know what I was doing. She has seen my d*** a few times and hasn't said nothing but smiles a little one time she got drunk so I fingered her p**** for like a minute she is a deep sleeper but I am wondering if I should ask her if she wants to have s**?